Results 171 to 180 of about 3,694 (226)

Pulverized polyurethane foam particles reinforced rigid polyurethane foam and phenolic foam

Journal of Applied Polymer Science, 2013
ABSTRACTPolyurethane consumption has been increasing in recent years, raising concerns about how to deal with the polymer waste. Post‐consumer rigid polyurethane foams or polyurethane foam scraps (PPU) ground into particles were utilized to strengthen mechanical properties of rigid polyurethane foam (PUF) and phenolic foam (PF). Viscosity of prepolymer
Chao Yang, Zhe‐Hui Zhuang, Zhen‐Guo Yang   +2 more
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Nanoclay‐Modified Rigid Polyurethane Foam

Journal of Macromolecular Science, Part B, 2005
Montmorillonite‐based organoclay was incorporated into rigid polyurethane foams. Clay was dispersed first in the isocyanate component ultrasonically. The dispersion was investigated using small angle X‐ray scattering and rheology. It was found that using toluene as common solvent enhanced dispersion significantly. The addition of 1 wt% clay resulted in
Tomy Widya, Christopher W. Macosko
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Nanoclay reinforced rigid polyurethane foams

Journal of Applied Polymer Science, 2010
AbstractClay was intercalated and exfoliated by neutralized dimethylol butanoic acid (DMBA) and used to fabricate rigid polyurethane foam (RPUF)/clay nanocomposites. Cream time, gel time, and tack‐free time increased with the addition and increasing amount of clay whereas foam density and compression strength decreased.
S. H. Kim, M. C. Lee, H. D. Kim, H. C. Park, H. M. Jeong, K. S. Yoon, B. K. Kim   +6 more
openaire   +1 more source

Epoxy modified polyurethane rigid foams

Journal of Polymer Science Part A: Polymer Chemistry, 1991
AbstractRigid IPN foams were prepared by sequential polymerization of polyurethane and epoxy systems. Significantly higher compressive modulus and strength were observed with the IPN foams in comparison to the corresponding polyurethane rigid foams. The IPN foams show one glass transition temperature.
Yng‐Long Lee, Wen‐Hsiung Ku, Jenq‐Der Tsou, Kuo‐Tung Wel, Po‐Hou Sung   +4 more
openaire   +1 more source

Phosphorus containing rigid polyurethane foams

European Polymer Journal, 1988
Abstract Rigid polyurethane foams have been synthesized on the basis of industrial raw materials and by use of phosphorus-containing flame retardants, obtained as a result of the interaction between dialkyl phosphites and amino alcohols. The rigid polyurethane foams thus obtained are described and their thermomechanical properties and fire resistance
E. Tashev, S. Shenkov, K. Troev, G. Borissov, L. Zabski, Z. Edlinski   +5 more
openaire   +1 more source

The microstructure of rigid polyurethane foams

Journal of Materials Science, 1982
A study has been made of the microstructure of rigid closed-cell polyurethane foams in the density range 35 to 420 kg m−3. Existing models for the structure of foams of this type have been evaluated using optical and scanning electron microscope techniques.
J. R. Dawson, J. B. Shortall
openaire   +1 more source

The Combustion of Rigid Polyurethane Foams

International Journal of Polymeric Materials, 1990
Abstract The effect of the porous structure on the flammability characteristics of rigid polyurethane foams is studied. It is found that the velocity of the downward flame spread over the surface of foam slabs increases as the oxygen content into the ambient flow increases and the effective density of PU foams decreases. The measurements of temperature
R. M. Aseeva, L. V. Ruban, Leszek Zabski
openaire   +1 more source

POLYURETHANE, FOAM-IN-PLACE, RIGID

2017
<div class="section abstract"> <div class="htmlview paragraph">This specification covers polyurethane systems consisting of an isocyanate component and other components containing a polyol and other ingredients which, when mixed and cured, produce thermosetting, rigid, cellular products.</div></div>
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Compressive Properties of Rigid Polyurethane Foams

Polymers and Polymer Composites, 1999
We have investigated the compressive stress-strain properties, and long-term compression set properties of highly crosslinked, rigid, polyurethane foams ranging in density from 100 kg m-3 to 810 kg nr-3. Samples were maintained under a range of compressive strains for periods ranging from three days to one year, and their dimensional recovery followed
Philip C. Miller Tate, Sina Talal
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Fracture properties of rigid polyurethane foams

Journal of Applied Polymer Science, 1975
AbstractThe fracture behavior of rigid polyurethane foams has been investigated and is shown to obey the Griffith criterion for fracture in so far as the predicted behavior of tensile strength on the size of artificially introduced cracks is concerned. The energy for crack propagation (fracture surface energy) has been measured as 91.4J/m2.
openaire   +1 more source